/** 
 * Copyright 2010 Daniel Guermeur and Amy Unruh
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 *   See http://connectrapp.appspot.com/ for a demo, and links to more information 
 *   about this app and the book that it accompanies.
 */
package org.noranj.formak.server.migrations;

import java.util.Map;

public interface Migration  {
	
  /** it runs when the schema modifications are added. */
  public Map<String,String> migrate_up(String cursor, int range, Map<String,String> params);
  /** it is run to back out of the changes. */
  public Map<String,String> migrate_down(String cursor, int range, Map<String,String> params); 
  
}